 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.core;

 import org.eclipse.core.runtime.*;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.update.internal.core.*;

 /**
  * Versioned Identifier. This is a utility class combining an identification
  * string with a version.
  * <p>
  * Clients may instantiate; not intended to be subclassed by clients.
  * </p>
  * <p>
  * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  * </p>
  * @see org.eclipse.core.runtime.PluginVersionIdentifier
  * @since 2.0
  */
 public class VersionedIdentifier {
     private String id;
     private PluginVersionIdentifier version;
     private static final String SEPARATOR = "_"; //$NON-NLS-1$

     /**
      * Construct a versioned identifier from an identifier and a string
      * representation of a version
      *
      * @see org.eclipse.core.runtime.PluginVersionIdentifier#toString()
      * @param id identifier string
      * @param versionName string representation of version
      * @since 2.0
      */
     public VersionedIdentifier(String id, String versionName) {
         if (id == null || (id = id.trim()).equals("")) //$NON-NLS-1$
 throw new IllegalArgumentException (
                 NLS.bind(Messages.VersionedIdentifier_IdOrVersionNull, (new String [] { id, versionName })));
         this.id = id;
         // 15707
 if (versionName != null){
             // if (PluginVersionIdentifier.validateVersionIdentifier(versionName).isOk())
 try {
                 this.version = new PluginVersionIdentifier(versionName);
             } catch (RuntimeException e){
                 UpdateCore.warn("Invalid Version:"+versionName,e); //$NON-NLS-1$
 }
         }
         if (this.version==null)
             version = new PluginVersionIdentifier(0, 0, 0);
     }

     /**
      * Returns the identifier
      *
      * @return identifier
      * @since 2.0
      */
     public String getIdentifier() {
         return id;
     }

     /**
      * Returns the version
      *
      * @return version
      * @since 2.0
      */
     public PluginVersionIdentifier getVersion() {
         return version;
     }

     /**
      * Returns a string representation of the versioned identifier.
      *
      * @return string representation of versioned identifier. The resulting
      * string is <id>_<version>, where <id> is the identifier and
      * <version> is the string representation of the version
      * @since 2.0
      */
     public String toString() {
         return id.equals("") ? "" : id + SEPARATOR + version.toString(); //$NON-NLS-1$ //$NON-NLS-2$
 }

     /**
      * Compares two versioned identifiers for equality
      *
      * @param obj other versioned identifier to compare to
      * @return <code>true</code> if the two objects are equal,
      * <code>false</code> otherwise
      * @since 2.0
      */
     public boolean equals(Object obj) {
         if (!(obj instanceof VersionedIdentifier))
             return false;
         VersionedIdentifier vid = (VersionedIdentifier) obj;
         if (!this.id.equals(vid.id))
             return false;
         return this.version.equals(vid.version);
     }

     /**
      * Returns a computed hashcode for the versioned identifier.
      *
      * @return hash code
      * @since 2.0
      */
     public int hashCode() {
         return toString().hashCode();
     }

 }

